"Just as my family and I arrived at the thermal pool, we see this guy cross over the barricades and head straight for the water," the woman who recorded the video said.

"Everyone around us was yelling for him to get out and to be careful. He did not look up and make eye contact with anyone. At one point, he took his shoes and socks off and attempted to put his feet in the water."

The trespasser sunk his bare feet into the steaming earth. In the video he is seen rubbing the feet with his hands. A woman who shot the video said he stayed behind the barricade for about "10 minutes" before returning to the trail.

The average temperature of the water in a Yellowstone hot spring is 143 degrees Fahrenheit, but much higher temperatures of geothermal activity have been recorded.

Yellowstone's Grand Prismatic Spring at the Midway Geyser Basin is one of the park's main attractions. Like all hot spring areas at the park, it's off limits to foot traffic. Visitors must keep to paths and boardwalks.

Yellowstone's Grand Prismatic Spring at the Midway Geyser Basin is one of the park's main attractions. Like all hot spring areas at the park, it's off limits to foot traffic. Visitors must keep to paths and

Yellowstone's Grand Prismatic Spring at the Midway Geyser Basin is one of the park's main attractions. Like all hot spring areas at the park, it's off limits to foot traffic. Visitors must keep to paths and boardwalks.

Yellowstone's Grand Prismatic Spring at the Midway Geyser Basin is one of the park's main attractions. Like all hot spring areas at the park, it's off limits to foot traffic. Visitors must keep to paths and

In June 2016, a brother and sister from Oregon left a protective boardwalk and hiked into the Norris Geyser Basin looking for an illegal soak, the Chicago Tribune reported. The park calls the activity "hot-potting."

The brother reached down to check the temperature of a gurgling spring when he slipped and tumbled in. He was never seen again. Rangers were unable to find the body, which was believed to have fully dissolved due to the chemical composition of the pool.

At least 22 people have died in the park's thermal pools since 1870. That compares to only eight people who have been killed by bears, at least seven of which were grizzlies.

Earlier this month, a tourist walked onto the Old Faithful geyser and lay down on the ground. He then got up and apparently urinated on the geyser. The man was ticketed by park officials.